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GSK announces first-line combination of ambrisentan and tadalafil reduces risk of clinical failure compared to monotherapy in pulmonary arterial hypertension outcomes study

4.3 Hypersensitivity Reactions
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Important Safety Information for ambrisentan and tadalafil in the European Union

Tadalafil 40mg is a higher dose used for severe erectile dysfunction.
Always consult a doctor before taking Tadalafil 40mg.
Avoid alcohol when using Tadalafil 40mg to prevent side effects.
Tadalafil 40mg should not be used more than once in 24 hours.
Possible side effects include headache, flushing, and nasal congestion.
Do not take Tadalafil 40mg with nitrates or alpha-blockers.

After 48 hours, the interaction was not detectable. [See Contraindications (4.1)].Effects on Blood Pressure.The effects of tadalafil on blood pressure alone and administered with antihypertensives, alcohol, and alpha-blockers is shown in Figure 1.a In some subjects, postural dizziness and orthostatic hypotension were observed. When tadalafil was administered with lower doses of alcohol (0.6 g/kg), hypotension was not observed, and dizziness occurred at a similar frequency to alcohol alone.b In studies of tadalafil co-administration with doxazosin, the number of subjects with potentially clinically significant standing blood pressure decreases was greater for the combination. Some patients had symptoms associated with the decrease in blood pressure including syncope.Figure 1: Effects of Tadalafil on Blood PressureEffects on Cardiac ElectrophysiologyThe effect of a single 100 mg dose of tadalafil (2.5 times the recommended dose) on the QT interval was evaluated at the time of peak tadalafil concentration in a randomized, double–blinded, placebo, and active–controlled (intravenous ibutilide) crossover study in 90 healthy males aged 18 to 53 years. The mean change in QTc (Fridericia QT correction) for tadalafil, relative to placebo, was 3.5 milliseconds (two–sided 90% CI=1.9, 5.1). The mean change in QTc (Individual QT correction) for tadalafil, relative to placebo, was 2.8 milliseconds (two–sided 90% CI=1.2, 4.4). In this study, the mean increase in heart rate associated with a 100 mg dose of tadalafil compared to placebo was 3.1 beats per minute.Effects on Exercise Stress TestingThe effects of tadalafil on cardiac function, hemodynamics, and exercise tolerance were investigated in a single clinical pharmacology study. In this blinded crossover trial, 23 subjects with stable coronary artery disease and evidence of exercise–induced cardiac ischemia were enrolled. The primary endpoint was time to cardiac ischemia. The mean difference in total exercise time was 3 seconds (tadalafil 10 mg minus placebo), which represented no clinically meaningful difference. Further statistical analysis demonstrated that tadalafil was similar to placebo with respect to time to ischemia. Of note, in this study, in some subjects who received tadalafil followed by sublingual nitroglycerin in the post– exercise period, clinically significant reductions in blood pressure were observed, consistent with the augmentation by tadalafil of the blood–pressure–lowering effects of nitrates.Effects on VisionSingle oral doses of PDE inhibitors have demonstrated transient dose-related impairment of color discrimination (blue/green), using the Farnsworth–Munsell 100–hue test, with peak effects near the time of peak plasma levels.

Population	Typical Dose Range	Notes
General adult males	20mg - 40mg	Adjust based on response and tolerance
Elderly	Usually lower dose	Due to potential liver and kidney function changes
Patients with hepatic impairment	Usually start at lower doses	Monitor response closely
Patients with renal impairment	Dose adjustment may be necessary	Depends on severity

This finding is consistent with the inhibition of PDE6, which is involved in phototransduction in the retina. In a study to assess the effects of a single dose of tadalafil 40 mg on vision (N=59), no effects were observed on visual acuity, intraocular pressure, or pupillometry. Across all clinical studies with tadalafil, reports of changes in color vision were rare (less than 0.1% of patients).Effects on Sperm CharacteristicsThree studies were conducted in men to assess the potential effect on sperm characteristics of tadalafil 10 mg (one 6-month study) and 20 mg (one 6-month and one 9-month study) administered daily. There were no adverse effects on sperm morphology or sperm motility in any of the three studies.

4.3 Hypersensitivity Reactions

At 48 hours, by most hemodynamic measures, the interaction between tadalafil and NTG was not observed, although a few more tadalafil subjects compared to placebo experienced greater blood–pressure lowering effects at this timepoint. After 48 hours, the interaction was not detectable. [See Contraindications (4.1)].Effects on Blood Pressure.The effects of tadalafil on blood pressure alone and administered with antihypertensives, alcohol, and alpha-blockers is shown in Figure 1.a In some subjects, postural dizziness and orthostatic hypotension were observed. When tadalafil was administered with lower doses of alcohol (0.6 g/kg), hypotension was not observed, and dizziness occurred at a similar frequency to alcohol alone.b In studies of tadalafil co-administration with doxazosin, the number of subjects with potentially clinically significant standing blood pressure decreases was greater for the combination. Some patients had symptoms associated with the decrease in blood pressure including syncope.Figure 1: Effects of Tadalafil on Blood PressureEffects on Cardiac ElectrophysiologyThe effect of a single 100 mg dose of tadalafil (2.5 times the recommended dose) on the QT interval was evaluated at the time of peak tadalafil concentration in a randomized, double–blinded, placebo, and active–controlled (intravenous ibutilide) crossover study in 90 healthy males aged 18 to 53 years.

Tadalafil for Heart Failure

The mean change in QTc (Fridericia QT correction) for tadalafil, relative to placebo, was 3.5 milliseconds (two–sided 90% CI=1.9, 5.1). The mean change in QTc (Individual QT correction) for tadalafil, relative to placebo, was 2.8 milliseconds (two–sided 90% CI=1.2, 4.4). In this study, the mean increase in heart rate associated with a 100 mg dose of tadalafil compared to placebo was 3.1 beats per minute.Effects on Exercise Stress TestingThe effects of tadalafil on cardiac function, hemodynamics, and exercise tolerance were investigated in a single clinical pharmacology study. In this blinded crossover trial, 23 subjects with stable coronary artery disease and evidence of exercise–induced cardiac ischemia were enrolled. The primary endpoint was time to cardiac ischemia.

Typical dosages

The mean difference in total exercise time was 3 seconds (tadalafil 10 mg minus placebo), which represented no clinically meaningful difference. Further statistical analysis demonstrated that tadalafil was similar to placebo with respect to time to ischemia. Of note, in this study, in some subjects who received tadalafil followed by sublingual nitroglycerin in the post– exercise period, clinically significant reductions in blood pressure were observed, consistent with the augmentation by tadalafil of the blood–pressure–lowering effects of nitrates.Effects on VisionSingle oral doses of PDE inhibitors have demonstrated transient dose-related impairment of color discrimination (blue/green), using the Farnsworth–Munsell 100–hue test, with peak effects near the time of peak plasma levels. This finding is consistent with the inhibition of PDE6, which is involved in phototransduction in the retina. In a study to assess the effects of a single dose of tadalafil 40 mg on vision (N=59), no effects were observed on visual acuity, intraocular pressure, or pupillometry. In the study of 10 mg tadalafil for 6 months and the study of 20 mg tadalafil for 9 months, results showed a decrease in mean sperm concentrations relative to placebo, although these differences were not clinically meaningful. In addition there was no adverse effect on mean concentrations of reproductive hormones, testosterone, luteinizing hormone or follicle stimulating hormone with either 10 mg or 20 mg of tadalafil compared to placebo.Dose-Response RelationshipDose-response relationships, between 20 mg and 40 mg, were not observed for 6-minute walk distance or pulmonary vascular resistance (PVR) in subjects with PAH in the placebo-controlled study. Median change from baseline in 6-minute walk distance was 32 meters and 35 meters at 16 weeks in subjects receiving 20 mg and 40 mg daily, respectively. Mean change from baseline PVR was -254 dynes*sec*cm-5 and -209 dynes*sec*cm-5 at 16 weeks in patients receiving 20 mg and 40 mg daily, respectively.12.3 PharmacokineticsOver a dose range of 2.5 mg to 20 mg, tadalafil exposure (AUC) increases proportionally with dose in healthy subjects. In PAH patients administered between 20 mg and 40 mg of tadalafil 60mg uk tadalafil, an approximately 1.5-fold greater AUC was observed indicating a less than proportional increase in exposure over the entire dose range of 2.5 mg to 40 mg. During tadalafil 20 and 40 mg once daily dosing, steady-state plasma concentrations were attained within 5 days, and exposure was approximately 1.3-fold higher than after a single dose.Absorption — After single oral-dose administration, the maximum observed plasma concentration (Cmax) of tadalafil is achieved between 2 and 8 hours (median time of 4 hours). Absolute bioavailability of tadalafil following oral dosing has not been determined.The rate and extent of absorption of tadalafil are not influenced by food; thus tadalafil tablets may be taken with or without food.Distribution — The mean apparent volume of distribution following oral administration is approximately 77 L, indicating that tadalafil is distributed into tissues.

Drug Class	Interaction Effect	Possible Outcome
Nitrates	Potentiate hypotensive effects	Dangerous blood pressure drop
CYP3A4 Inhibitors	Increase tadalafil levels	Higher risk of side effects
CYP3A4 Inducers	Decrease tadalafil effectiveness	Reduced therapeutic effect
Alpha-blockers	Additive blood pressure-lowering effects	Dizziness, fainting

At therapeutic concentrations, 94% of tadalafil in plasma is bound to proteins.Metabolism — Tadalafil is predominantly metabolized by CYP3A to a catechol metabolite.

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Cialis Generic	20mg	90 + 6 Pills	154.71€ 147.34€
Tadalista Super Active	20mg	60 + 8 Pills	230.32€ 219.35€
Tadalista Super Active	20mg	270 + 30 Pills	661.49€ 629.99€
Cialis Generic	5mg	20 Pills	41.99€ 39.99€
Cialis Generic	10mg	20 Pills	48.23€ 45.93€
Cialis Generic	20mg	270 + 10 Pills	335.21€ 319.25€
Cialis Generic	20mg	360 + 10 Pills	427.34€ 406.99€
Cialis Generic	20mg	120 + 8 Pills	188.15€ 179.19€
Cialis Generic	60mg	180 + 10 Pills	313.11€ 298.20€

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Exposure to total methylcatechol (unconjugated plus glucuronide) was 2- to 4-fold higher in subjects with renal impairment, compared to those with normal renal function. Hemodialysis (performed between 24 and 30 hours post-dose) contributed negligibly to tadalafil or metabolite elimination [see Dosage and Administration (2.2)].Hepatic impairmentIn clinical pharmacology studies, tadalafil exposure (AUC) in subjects with mild or moderate hepatic impairment (Child-Pugh Class A or B) was comparable to exposure in healthy subjects when a dose of 10 mg was administered. There are no available data for doses higher than 10 mg of tadalafil in patients with hepatic impairment. Insufficient data are available for subjects with severe hepatic impairment (Child-Pugh Class C) [see Dosage and Administration (2.3)].Patients with diabetes mellitusIn male patients with diabetes mellitus after a 10 mg tadalafil dose, exposure (AUC) was reduced approximately 19% and Cmax was 5% lower than that observed in healthy subjects. No dose adjustment is warranted.RacePharmacokinetic studies have included subjects from different ethnic groups, and no differences in the typical exposure to tadalafil have been identified.

Serious Tadalafil Side Effects (Occurring in less than 1 in 1,000 people)

No dose adjustment is warranted.GenderIn healthy female and male subjects following single and multiple-doses of tadalafil, no clinically relevant differences in exposure (AUC and Cmax) were observed. No dose adjustment is warranted.Drug interaction studiesTadalafil is a substrate of and predominantly metabolized by CYP3A.Cytochrome P450 3A4 inhibitorsKetoconazole increased tadalafil exposure relative to the values for tadalafil alone (Figure 2). Although specific interactions have not been studied, other CYP3A inhibitors, such as erythromycin, itraconazole, and grapefruit juice, would likely increase tadalafil exposure.RitonavirRitonavir increased tadalafil 20–mg single-dose exposure relative to the values for tadalafil alone. Ritonavir inhibits and induces CYP3A, the enzyme involved in the metabolism of tadalafil, in a time-dependent manner. The initial inhibitory effect of ritonavir on CYP3A may be mitigated by a more slowly evolving induction effect so that after about 1 week of ritonavir twice daily, the exposure of tadalafil is similar in the presence of and absence of ritonavir [see Dosage and Administration (2.4) and Drug Interactions (7.5)].

Missed Dose

In patients with pulmonary hypertension not receiving concomitant bosentan, the mean oral clearance for tadalafil is 1.6 L/hr, and the mean terminal half-life is 35 hours.

Tadalafil 40mg is available in some countries only as a prescription medication.
Use with caution in patients with retinal disorders or retinitis pigmentosa.
Be aware of possible side effects like dizziness, visual disturbances, or flushing.
Do not use this medication if you have recently had a stroke or heart attack.
Tadalafil 40mg can help improve quality of life for men with ED.
Always discuss your full medical history with your healthcare provider beforehand.

Tadalafil is excreted predominantly as metabolites, mainly in the feces (approximately 61% of the dose) and to a lesser extent in the urine (approximately 36% of the dose).Population pharmacokinetics — In patients with pulmonary hypertension not receiving concomitant bosentan, the average tadalafil exposure at steady-state following 40 mg was 26% higher when compared to those of healthy volunteers. The results suggest a lower clearance of tadalafil in patients with pulmonary hypertension compared to healthy volunteers.Geriatric patientsIn healthy male elderly subjects (65 years or over) after a 10 mg dose, a lower oral clearance of tadalafil, resulting in 25% higher exposure (AUC) with no effect on Cmax was observed relative to that in healthy subjects 19 to 45 years of age.Renal impairmentIn clinical pharmacology studies using single-dose tadalafil (5 mg to 10 mg), tadalafil exposure (AUC) doubled in subjects with mild (creatinine clearance 51 mL/min to 80 mL/min) or moderate (creatinine clearance 31 mL/min to 50 mL/min) renal impairment.

Use Case	Intended Effect	Typical Dosage	Onset Time	Duration of Action
Erectile Dysfunction	Improve erectile response	40mg as needed	30-60 min	Up to 36 hours
Pulmonary Hypertension	Relieve symptoms, reduce BP in lungs	40mg daily or as prescribed	15-30 min	6-8 hours
Benign Prostatic Hyperplasia	Improve urinary flow	40mg daily	30 min	Up to 24 hours

In subjects with end-stage renal disease on hemodialysis, there was a two-fold increase in Cmax and 2.7- to 4.1-fold increase in AUC following single-dose administration of 10 mg or 20 mg tadalafil, respectively. Exposure to total methylcatechol (unconjugated plus glucuronide) was 2- to 4-fold higher in subjects with renal impairment, compared to those with normal renal function.

Tadalafil 40mg is sometimes prescribed for pulmonary hypertension.
Regular use of Tadalafil 40mg may help in certain benign prostatic hyperplasia cases.
Use caution if you have kidney or liver problems before taking this dose.
It's essential to follow your healthcare provider’s dosage instructions.
Combining Tadalafil 40mg with other ED medications can increase risk.
Alcohol can enhance side effects of Tadalafil, such as dizziness and low blood pressure.

Hemodialysis (performed between 24 and 30 hours post-dose) contributed negligibly to tadalafil or metabolite elimination [see Dosage and Administration (2.2)].Hepatic impairmentIn clinical pharmacology studies, tadalafil exposure (AUC) in subjects with mild or moderate hepatic impairment (Child-Pugh Class A or B) was comparable to exposure in healthy subjects when a dose of 10 mg was administered. There are no available data for doses higher than 10 mg of tadalafil in patients with hepatic impairment.

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Across all clinical studies with tadalafil, reports of changes in color vision were rare (less than 0.1% of patients).Effects on Sperm CharacteristicsThree studies were conducted in men to assess the potential effect on sperm characteristics of tadalafil 10 mg (one 6-month study) and 20 mg (one 6-month and one 9-month study) administered daily. There were no adverse effects on sperm morphology or sperm motility in any of the three studies. In the study of 10 mg tadalafil for 6 months and the study of 20 mg tadalafil for 9 months, results showed a decrease in mean sperm concentrations relative to placebo, although these differences were not clinically meaningful. In addition there was no adverse effect on mean concentrations of reproductive hormones, testosterone, luteinizing hormone or follicle stimulating hormone with either 10 mg or 20 mg of tadalafil compared to placebo.Dose-Response RelationshipDose-response relationships, between 20 mg and 40 mg, were not observed for 6-minute walk distance or pulmonary vascular resistance (PVR) in subjects with PAH in the placebo-controlled study. Median change from baseline in 6-minute walk distance was 32 meters and 35 meters at 16 weeks in subjects receiving 20 mg and 40 mg daily, respectively.

What should I do for a missed dose of tadalafil?

In vitro data suggests that metabolites are not expected to be pharmacologically active at observed metabolite concentrations.Elimination — Following 40 mg, the mean oral clearance for tadalafil is 3.4 L/hr and the mean terminal half-life is 15 hours in healthy subjects. In patients with pulmonary hypertension not receiving concomitant bosentan, the mean oral clearance for tadalafil is 1.6 L/hr, and the mean terminal half-life is 35 hours. Tadalafil is excreted predominantly as metabolites, mainly in the feces (approximately 61% of the dose) and to a lesser extent in the urine (approximately 36% of the dose).Population pharmacokinetics — In patients with pulmonary hypertension not receiving concomitant bosentan, the average tadalafil exposure at steady-state following 40 mg was 26% higher when compared to those of healthy volunteers. The results suggest a lower clearance of tadalafil in patients with pulmonary hypertension compared to healthy volunteers.Geriatric patientsIn healthy male elderly subjects (65 years or over) after a 10 mg dose, a lower oral clearance of tadalafil, resulting in 25% higher exposure (AUC) with no effect on Cmax was observed relative to that in healthy subjects 19 to 45 years of age.Renal impairmentIn clinical pharmacology studies using single-dose tadalafil (5 mg to 10 mg), tadalafil exposure (AUC) doubled in subjects with mild (creatinine clearance 51 mL/min to 80 mL/min) or moderate (creatinine clearance 31 mL/min to 50 mL/min) renal impairment. In subjects with end-stage renal disease on hemodialysis, there was a two-fold increase in Cmax and 2.7- to 4.1-fold increase in AUC following single-dose administration of 10 mg or 20 mg tadalafil, respectively. Insufficient data are available for subjects with severe hepatic impairment (Child-Pugh Class C) [see Dosage and Administration (2.3)].Patients with diabetes mellitusIn male patients with diabetes mellitus after a 10 mg tadalafil dose, exposure (AUC) was reduced approximately 19% and Cmax was 5% lower than that observed in healthy subjects. No dose adjustment is warranted.RacePharmacokinetic studies have included subjects from different ethnic groups, and no differences in the typical exposure to tadalafil have been identified. No dose adjustment is warranted.GenderIn healthy female and male subjects following single and multiple-doses of tadalafil, no clinically relevant differences in exposure (AUC and Cmax) were observed. No dose adjustment is warranted.Drug interaction studiesTadalafil is a substrate of and predominantly metabolized by CYP3A.Cytochrome P450 3A4 inhibitorsKetoconazole increased tadalafil exposure relative to the values for tadalafil alone (Figure 2). Although specific interactions have not been studied, other CYP3A inhibitors, such as erythromycin, itraconazole, and grapefruit juice, would likely increase tadalafil exposure.RitonavirRitonavir increased tadalafil 20–mg single-dose exposure relative to the values for tadalafil alone. Ritonavir inhibits and induces CYP3A, the enzyme involved in the metabolism of tadalafil, in a time-dependent manner.

Important Safety Information for ambrisentan and tadalafil in the European Union

If you take more than the recommended amount of tadalafil

The initial inhibitory effect of ritonavir on CYP3A may be mitigated by a more slowly evolving induction effect so that after about 1 week of ritonavir twice daily, the exposure of tadalafil is similar in the presence of and absence of ritonavir [see Dosage and Administration (2.4) and Drug Interactions (7.5)].